<?php
namespace App\Libraries;

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package   CodeIgniter
 * @author    ExpressionEngine Dev Team
 * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
 * @license   http://codeigniter.com/user_guide/license.html
 * @link    http://codeigniter.com
 * @since   Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Image Manipulation class
 *
 * @package   CodeIgniter
 * @subpackage  Libraries
 * @category  Image_lib
 * @author    ExpressionEngine Dev Team
 * @link    http://codeigniter.com/user_guide/libraries/image_lib.html
 */
class ImageLib {

	var $image_library = 'gd2'; // Can be:  imagemagick, netpbm, gd, gd2
	var $library_path = '';
	var $dynamic_output = FALSE; // Whether to send to browser or write to disk
	var $source_image = '';
	var $new_image = '';
	var $width = '';
	var $height = '';
	var $quality = '90';
	var $create_thumb = FALSE;
	var $thumb_marker = '_thumb';
	var $maintain_ratio = TRUE; // Whether to maintain aspect ratio when resizing or use hard values
	var $master_dim = 'auto'; // auto, height, or width.  Determines what to use as the master dimension
	var $rotation_angle = '';
	var $x_axis = '';
	var $y_axis = '';

	// Watermark Vars
	var $wm_text = ''; // Watermark text if graphic is not used
	var $wm_type = 'text'; // Type of watermarking.  Options:  text/overlay
	var $wm_x_transp = 4;
	var $wm_y_transp = 4;
	var $wm_overlay_path = ''; // Watermark image path
	var $wm_font_path = ''; // TT font
	var $wm_font_size = 17; // Font size (different versions of GD will either use points or pixels)
	var $wm_vrt_alignment = 'B'; // Vertical alignment:   T M B
	var $wm_hor_alignment = 'C'; // Horizontal alignment: L R C
	var $wm_padding = 0; // Padding around text
	var $wm_hor_offset = 0; // Lets you push text to the right
	var $wm_vrt_offset = 0; // Lets you push  text down
	var $wm_font_color = '#ffffff'; // Text color
	var $wm_shadow_color = ''; // Dropshadow color
	var $wm_shadow_distance = 2; // Dropshadow distance
	var $wm_opacity = 50; // Image opacity: 1 - 100  Only works with image

	// Private Vars
	var $source_folder = '';
	var $dest_folder = '';
	var $mime_type = '';
	var $orig_width = '';
	var $orig_height = '';
	var $image_type = '';
	var $size_str = '';
	var $full_src_path = '';
	var $full_dst_path = '';
	var $create_fnc = 'imagecreatetruecolor';
	var $copy_fnc = 'imagecopyresampled';
	var $error_msg = array();
	var $wm_use_drop_shadow = FALSE;
	var $wm_use_truetype = FALSE;

	/**
	 * Constructor
	 *
	 * @param string
	 * @return  void
	 */
	public function __construct($props = array()) {
		if (count($props) > 0) {
			$this->initialize($props);
		}

		// log_message('debug', "Image Lib Class Initialized");
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize image properties
	 *
	 * Resets values in case this class is used in a loop
	 *
	 * @access  public
	 * @return  void
	 */
	function clear() {
		$props = array('source_folder', 'dest_folder', 'source_image', 'full_src_path', 'full_dst_path', 'new_image', 'image_type', 'size_str', 'quality', 'orig_width', 'orig_height', 'width', 'height', 'rotation_angle', 'x_axis', 'y_axis', 'create_fnc', 'copy_fnc', 'wm_overlay_path', 'wm_use_truetype', 'dynamic_output', 'wm_font_size', 'wm_text', 'wm_vrt_alignment', 'wm_hor_alignment', 'wm_padding', 'wm_hor_offset', 'wm_vrt_offset', 'wm_font_color', 'wm_use_drop_shadow', 'wm_shadow_color', 'wm_shadow_distance', 'wm_opacity');

		foreach ($props as $val) {
			$this->$val = '';
		}

		// special consideration for master_dim
		$this->master_dim = 'auto';
	}

	// --------------------------------------------------------------------

	/**
	 * initialize image preferences
	 *
	 * @access  public
	 * @param array
	 * @return  bool
	 */
	function initialize($props = array()) {
		/*
		 * Convert array elements into class variables
		 */
		if (count($props) > 0) {
			foreach ($props as $key => $val) {
				$this->$key = $val;
			}
		}

		/*
		 * Is there a source image?
		 *
		 * If not, there's no reason to continue
		 *
		 */
		if ($this->source_image == '') {
			$this->set_error('imglib_source_image_required');
			return FALSE;
		}

		/*
		 * Is getimagesize() Available?
		 *
		 * We use it to determine the image properties (width/height).
		 * Note:  We need to figure out how to determine image
		 * properties using ImageMagick and NetPBM
		 *
		 */
		if (!function_exists('getimagesize')) {
			$this->set_error('imglib_gd_required_for_props');
			return FALSE;
		}

		$this->image_library = strtolower($this->image_library);

		/*
		 * Set the full server path
		 *
		 * The source image may or may not contain a path.
		 * Either way, we'll try use realpath to generate the
		 * full server path in order to more reliably read it.
		 *
		 */
		if (function_exists('realpath') AND @realpath($this->source_image) !== FALSE) {
			$full_source_path = str_replace("\\", "/", realpath($this->source_image));
		} else {
			$full_source_path = $this->source_image;
		}

		$x = explode('/', $full_source_path);
		$this->source_image = end($x);
		$this->source_folder = str_replace($this->source_image, '', $full_source_path);

		// Set the Image Properties
		if (!$this->get_image_properties($this->source_folder . $this->source_image)) {
			return FALSE;
		}

		/*
		 * Assign the "new" image name/path
		 *
		 * If the user has set a "new_image" name it means
		 * we are making a copy of the source image. If not
		 * it means we are altering the original.  We'll
		 * set the destination filename and path accordingly.
		 *
		 */
		if ($this->new_image == '') {
			$this->dest_image = $this->source_image;
			$this->dest_folder = $this->source_folder;
		} else {
			if (strpos($this->new_image, '/') === FALSE AND strpos($this->new_image, '\\') === FALSE) {
				$this->dest_folder = $this->source_folder;
				$this->dest_image = $this->new_image;
			} else {
				if (function_exists('realpath') AND @realpath($this->new_image) !== FALSE) {
					$full_dest_path = str_replace("\\", "/", realpath($this->new_image));
				} else {
					$full_dest_path = $this->new_image;
				}

				// Is there a file name?
				if (!preg_match("#\.(jpg|jpeg|gif|png)$#i", $full_dest_path)) {
					$this->dest_folder = $full_dest_path . '/';
					$this->dest_image = $this->source_image;
				} else {
					$x = explode('/', $full_dest_path);
					$this->dest_image = end($x);
					$this->dest_folder = str_replace($this->dest_image, '', $full_dest_path);
				}
			}
		}

		/*
		 * Compile the finalized filenames/paths
		 *
		 * We'll create two master strings containing the
		 * full server path to the source image and the
		 * full server path to the destination image.
		 * We'll also split the destination image name
		 * so we can insert the thumbnail marker if needed.
		 *
		 */
		if ($this->create_thumb === FALSE OR $this->thumb_marker == '') {
			$this->thumb_marker = '';
		}

		$xp = $this->explode_name($this->dest_image);

		$filename = $xp['name'];
		$file_ext = $xp['ext'];

		$this->full_src_path = $this->source_folder . $this->source_image;
		$this->full_dst_path = $this->dest_folder . $filename . $this->thumb_marker . $file_ext;

		/*
		 * Should we maintain image proportions?
		 *
		 * When creating thumbs or copies, the target width/height
		 * might not be in correct proportion with the source
		 * image's width/height.  We'll recalculate it here.
		 *
		 */
		if ($this->maintain_ratio === TRUE && ($this->width != '' AND $this->height != '')) {
			$this->image_reproportion();
		}

		/*
		 * Was a width and height specified?
		 *
		 * If the destination width/height was
		 * not submitted we will use the values
		 * from the actual file
		 *
		 */
		if ($this->width == '') {
			$this->width = $this->orig_width;
		}

		if ($this->height == '') {
			$this->height = $this->orig_height;
		}

		// Set the quality
		$this->quality = trim(str_replace("%", "", $this->quality));

		if ($this->quality == '' OR $this->quality == 0 OR !is_numeric($this->quality)) {
			$this->quality = 90;
		}

		// Set the x/y coordinates
		$this->x_axis = ($this->x_axis == '' OR !is_numeric($this->x_axis)) ? 0 : $this->x_axis;
		$this->y_axis = ($this->y_axis == '' OR !is_numeric($this->y_axis)) ? 0 : $this->y_axis;

		// Watermark-related Stuff...
		if ($this->wm_font_color != '') {
			if (strlen($this->wm_font_color) == 6) {
				$this->wm_font_color = '#' . $this->wm_font_color;
			}
		}

		if ($this->wm_shadow_color != '') {
			if (strlen($this->wm_shadow_color) == 6) {
				$this->wm_shadow_color = '#' . $this->wm_shadow_color;
			}
		}

		if ($this->wm_overlay_path != '') {
			$this->wm_overlay_path = str_replace("\\", "/", realpath($this->wm_overlay_path));
		}

		if ($this->wm_shadow_color != '') {
			$this->wm_use_drop_shadow = TRUE;
		}

		if ($this->wm_font_path != '') {
			$this->wm_use_truetype = TRUE;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Resize
	 *
	 * This is a wrapper function that chooses the proper
	 * resize function based on the protocol specified
	 *
	 * @access  public
	 * @return  bool
	 */
	function resize() {
		$protocol = 'image_process_' . $this->image_library;

		if (preg_match('/gd2$/i', $protocol)) {
			$protocol = 'image_process_gd';
		}

		return $this->$protocol('resize');
	}

	// --------------------------------------------------------------------

	/**
	 * Image Crop
	 *
	 * This is a wrapper function that chooses the proper
	 * cropping function based on the protocol specified
	 *
	 * @access  public
	 * @return  bool
	 */
	function crop() {
		$protocol = 'image_process_' . $this->image_library;

		if (preg_match('/gd2$/i', $protocol)) {
			$protocol = 'image_process_gd';
		}

		return $this->$protocol('crop');
	}

	// --------------------------------------------------------------------

	/**
	 * Image Rotate
	 *
	 * This is a wrapper function that chooses the proper
	 * rotation function based on the protocol specified
	 *
	 * @access  public
	 * @return  bool
	 */
	function rotate() {
		// Allowed rotation values
		$degs = array(90, 180, 270, 'vrt', 'hor');

		if ($this->rotation_angle == '' OR !in_array($this->rotation_angle, $degs)) {
			$this->set_error('imglib_rotation_angle_required');
			return FALSE;
		}

		// Reassign the width and height
		if ($this->rotation_angle == 90 OR $this->rotation_angle == 270) {
			$this->width = $this->orig_height;
			$this->height = $this->orig_width;
		} else {
			$this->width = $this->orig_width;
			$this->height = $this->orig_height;
		}

		// Choose resizing function
		if ($this->image_library == 'imagemagick' OR $this->image_library == 'netpbm') {
			$protocol = 'image_process_' . $this->image_library;

			return $this->$protocol('rotate');
		}

		if ($this->rotation_angle == 'hor' OR $this->rotation_angle == 'vrt') {
			return $this->image_mirror_gd();
		} else {
			return $this->image_rotate_gd();
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Image Process Using GD/GD2
	 *
	 * This function will resize or crop
	 *
	 * @access  public
	 * @param string
	 * @return  bool
	 */
	function image_process_gd($action = 'resize') {
		$v2_override = FALSE;

		// If the target width/height match the source, AND if the new file name is not equal to the old file name
		// we'll simply make a copy of the original with the new name... assuming dynamic rendering is off.
		if ($this->dynamic_output === FALSE) {
			if ($this->orig_width == $this->width AND $this->orig_height == $this->height) {
				if ($this->source_image != $this->new_image) {
					if (@copy($this->full_src_path, $this->full_dst_path)) {
						@chmod($this->full_dst_path, FILE_WRITE_MODE);
					}
				}

				return TRUE;
			}
		}

		// Let's set up our values based on the action
		if ($action == 'crop') {
			//  Reassign the source width/height if cropping
			$this->orig_width = $this->width;
			$this->orig_height = $this->height;

			// GD 2.0 has a cropping bug so we'll test for it
			if ($this->gd_version() !== FALSE) {
				$gd_version = str_replace('0', '', $this->gd_version());
				$v2_override = ($gd_version == 2) ? TRUE : FALSE;
			}
		} else {
			// If resizing the x/y axis must be zero
			$this->x_axis = 0;
			$this->y_axis = 0;
		}

		//  Create the image handle
		if (!($src_img = $this->image_create_gd())) {
			return FALSE;
		}

		//  Create The Image
		//
		//  old conditional which users report cause problems with shared GD libs who report themselves as "2.0 or greater"
		//  it appears that this is no longer the issue that it was in 2004, so we've removed it, retaining it in the comment
		//  below should that ever prove inaccurate.
		//
		//  if ($this->image_library == 'gd2' AND function_exists('imagecreatetruecolor') AND $v2_override == FALSE)
		if ($this->image_library == 'gd2' AND function_exists('imagecreatetruecolor')) {
			$create = 'imagecreatetruecolor';
			$copy = 'imagecopyresampled';
		} else {
			$create = 'imagecreate';
			$copy = 'imagecopyresized';
		}

		$dst_img = $create($this->width, $this->height);

		if ($this->image_type == 3) // png we can actually preserve transparency
		{
			imagealphablending($dst_img, FALSE);
			imagesavealpha($dst_img, TRUE);
		}

		$copy($dst_img, $src_img, 0, 0, $this->x_axis, $this->y_axis, $this->width, $this->height, $this->orig_width, $this->orig_height);

		//  Show the image
		if ($this->dynamic_output == TRUE) {
			$this->image_display_gd($dst_img);
		} else {
			// Or save it
			if (!$this->image_save_gd($dst_img)) {
				return FALSE;
			}
		}

		//  Kill the file handles
		imagedestroy($dst_img);
		imagedestroy($src_img);

		// Set the file to 777
		@chmod($this->full_dst_path, FILE_WRITE_MODE);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Process Using ImageMagick
	 *
	 * This function will resize, crop or rotate
	 *
	 * @access  public
	 * @param string
	 * @return  bool
	 */
	function image_process_imagemagick($action = 'resize') {
		//  Do we have a vaild library path?
		if ($this->library_path == '') {
			$this->set_error('imglib_libpath_invalid');
			return FALSE;
		}

		if (!preg_match("/convert$/i", $this->library_path)) {
			$this->library_path = rtrim($this->library_path, '/') . '/';

			$this->library_path .= 'convert';
		}

		// Execute the command
		$cmd = $this->library_path . " -quality " . $this->quality;

		if ($action == 'crop') {
			$cmd .= " -crop " . $this->width . "x" . $this->height . "+" . $this->x_axis . "+" . $this->y_axis . " \"$this->full_src_path\" \"$this->full_dst_path\" 2>&1";
		} elseif ($action == 'rotate') {
			switch ($this->rotation_angle) {
				case 'hor':$angle = '-flop';
					break;
				case 'vrt':$angle = '-flip';
					break;
				default:$angle = '-rotate ' . $this->rotation_angle;
					break;
			}

			$cmd .= " " . $angle . " \"$this->full_src_path\" \"$this->full_dst_path\" 2>&1";
		} else // Resize
		{
			$cmd .= " -resize " . $this->width . "x" . $this->height . " \"$this->full_src_path\" \"$this->full_dst_path\" 2>&1";
		}

		$retval = 1;

		@exec($cmd, $output, $retval);

		//  Did it work?
		if ($retval > 0) {
			$this->set_error('imglib_image_process_failed');
			return FALSE;
		}

		// Set the file to 777
		@chmod($this->full_dst_path, FILE_WRITE_MODE);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Process Using NetPBM
	 *
	 * This function will resize, crop or rotate
	 *
	 * @access  public
	 * @param string
	 * @return  bool
	 */
	function image_process_netpbm($action = 'resize') {
		if ($this->library_path == '') {
			$this->set_error('imglib_libpath_invalid');
			return FALSE;
		}

		//  Build the resizing command
		switch ($this->image_type) {
			case 1:
				$cmd_in = 'giftopnm';
				$cmd_out = 'ppmtogif';
				break;
			case 2:
				$cmd_in = 'jpegtopnm';
				$cmd_out = 'ppmtojpeg';
				break;
			case 3:
				$cmd_in = 'pngtopnm';
				$cmd_out = 'ppmtopng';
				break;
		}

		if ($action == 'crop') {
			$cmd_inner = 'pnmcut -left ' . $this->x_axis . ' -top ' . $this->y_axis . ' -width ' . $this->width . ' -height ' . $this->height;
		} elseif ($action == 'rotate') {
			switch ($this->rotation_angle) {
				case 90:$angle = 'r270';
					break;
				case 180:$angle = 'r180';
					break;
				case 270:$angle = 'r90';
					break;
				case 'vrt':$angle = 'tb';
					break;
				case 'hor':$angle = 'lr';
					break;
			}

			$cmd_inner = 'pnmflip -' . $angle . ' ';
		} else // Resize
		{
			$cmd_inner = 'pnmscale -xysize ' . $this->width . ' ' . $this->height;
		}

		$cmd = $this->library_path . $cmd_in . ' ' . $this->full_src_path . ' | ' . $cmd_inner . ' | ' . $cmd_out . ' > ' . $this->dest_folder . 'netpbm.tmp';

		$retval = 1;

		@exec($cmd, $output, $retval);

		//  Did it work?
		if ($retval > 0) {
			$this->set_error('imglib_image_process_failed');
			return FALSE;
		}

		// With NetPBM we have to create a temporary image.
		// If you try manipulating the original it fails so
		// we have to rename the temp file.
		copy($this->dest_folder . 'netpbm.tmp', $this->full_dst_path);
		unlink($this->dest_folder . 'netpbm.tmp');
		@chmod($this->full_dst_path, FILE_WRITE_MODE);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Rotate Using GD
	 *
	 * @access  public
	 * @return  bool
	 */
	function image_rotate_gd() {
		//  Create the image handle
		if (!($src_img = $this->image_create_gd())) {
			return FALSE;
		}

		// Set the background color
		// This won't work with transparent PNG files so we are
		// going to have to figure out how to determine the color
		// of the alpha channel in a future release.

		$white = imagecolorallocate($src_img, 255, 255, 255);

		//  Rotate it!
		$dst_img = imagerotate($src_img, $this->rotation_angle, $white);

		//  Save the Image
		if ($this->dynamic_output == TRUE) {
			$this->image_display_gd($dst_img);
		} else {
			// Or save it
			if (!$this->image_save_gd($dst_img)) {
				return FALSE;
			}
		}

		//  Kill the file handles
		imagedestroy($dst_img);
		imagedestroy($src_img);

		// Set the file to 777

		@chmod($this->full_dst_path, FILE_WRITE_MODE);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Create Mirror Image using GD
	 *
	 * This function will flip horizontal or vertical
	 *
	 * @access  public
	 * @return  bool
	 */
	function image_mirror_gd() {
		if (!$src_img = $this->image_create_gd()) {
			return FALSE;
		}

		$width = $this->orig_width;
		$height = $this->orig_height;

		if ($this->rotation_angle == 'hor') {
			for ($i = 0; $i < $height; $i++) {
				$left = 0;
				$right = $width - 1;

				while ($left < $right) {
					$cl = imagecolorat($src_img, $left, $i);
					$cr = imagecolorat($src_img, $right, $i);

					imagesetpixel($src_img, $left, $i, $cr);
					imagesetpixel($src_img, $right, $i, $cl);

					$left++;
					$right--;
				}
			}
		} else {
			for ($i = 0; $i < $width; $i++) {
				$top = 0;
				$bot = $height - 1;

				while ($top < $bot) {
					$ct = imagecolorat($src_img, $i, $top);
					$cb = imagecolorat($src_img, $i, $bot);

					imagesetpixel($src_img, $i, $top, $cb);
					imagesetpixel($src_img, $i, $bot, $ct);

					$top++;
					$bot--;
				}
			}
		}

		//  Show the image
		if ($this->dynamic_output == TRUE) {
			$this->image_display_gd($src_img);
		} else {
			// Or save it
			if (!$this->image_save_gd($src_img)) {
				return FALSE;
			}
		}

		//  Kill the file handles
		imagedestroy($src_img);

		// Set the file to 777
		@chmod($this->full_dst_path, FILE_WRITE_MODE);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Watermark
	 *
	 * This is a wrapper function that chooses the type
	 * of watermarking based on the specified preference.
	 *
	 * @access  public
	 * @param string
	 * @return  bool
	 */
	function watermark() {
		if ($this->wm_type == 'overlay') {
			return $this->overlay_watermark();
		} else {
			return $this->text_watermark();
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Watermark - Graphic Version
	 *
	 * @access  public
	 * @return  bool
	 */
	function overlay_watermark() {
		if (!function_exists('imagecolortransparent')) {
			$this->set_error('imglib_gd_required');
			return FALSE;
		}

		//  Fetch source image properties
		$this->get_image_properties();

		//  Fetch watermark image properties
		$props = $this->get_image_properties($this->wm_overlay_path, TRUE);
		$wm_img_type = $props['image_type'];
		$wm_width = $props['width'];
		$wm_height = $props['height'];

		//  Create two image resources
		$wm_img = $this->image_create_gd($this->wm_overlay_path, $wm_img_type);
		$src_img = $this->image_create_gd($this->full_src_path);

		// Reverse the offset if necessary
		// When the image is positioned at the bottom
		// we don't want the vertical offset to push it
		// further down.  We want the reverse, so we'll
		// invert the offset.  Same with the horizontal
		// offset when the image is at the right

		$this->wm_vrt_alignment = strtoupper(substr($this->wm_vrt_alignment, 0, 1));
		$this->wm_hor_alignment = strtoupper(substr($this->wm_hor_alignment, 0, 1));

		if ($this->wm_vrt_alignment == 'B') {
			$this->wm_vrt_offset = $this->wm_vrt_offset * -1;
		}

		if ($this->wm_hor_alignment == 'R') {
			$this->wm_hor_offset = $this->wm_hor_offset * -1;
		}

		//  Set the base x and y axis values
		$x_axis = $this->wm_hor_offset + $this->wm_padding;
		$y_axis = $this->wm_vrt_offset + $this->wm_padding;

		//  Set the vertical position
		switch ($this->wm_vrt_alignment) {
			case 'T':
				break;
			case 'M':$y_axis += ($this->orig_height / 2) - ($wm_height / 2);
				break;
			case 'B':$y_axis += $this->orig_height - $wm_height;
				break;
		}

		//  Set the horizontal position
		switch ($this->wm_hor_alignment) {
			case 'L':
				break;
			case 'C':$x_axis += ($this->orig_width / 2) - ($wm_width / 2);
				break;
			case 'R':$x_axis += $this->orig_width - $wm_width;
				break;
		}

		//  Build the finalized image
		if ($wm_img_type == 3 AND function_exists('imagealphablending')) {
			@imagealphablending($src_img, TRUE);
		}

		// Set RGB values for text and shadow
		$rgba = imagecolorat($wm_img, $this->wm_x_transp, $this->wm_y_transp);
		$alpha = ($rgba & 0x7F000000) >> 24;

		// make a best guess as to whether we're dealing with an image with alpha transparency or no/binary transparency
		if ($alpha > 0) {
			// copy the image directly, the image's alpha transparency being the sole determinant of blending
			imagecopy($src_img, $wm_img, $x_axis, $y_axis, 0, 0, $wm_width, $wm_height);
		} else {
			// set our RGB value from above to be transparent and merge the images with the specified opacity
			imagecolortransparent($wm_img, imagecolorat($wm_img, $this->wm_x_transp, $this->wm_y_transp));
			imagecopymerge($src_img, $wm_img, $x_axis, $y_axis, 0, 0, $wm_width, $wm_height, $this->wm_opacity);
		}

		//  Output the image
		if ($this->dynamic_output == TRUE) {
			$this->image_display_gd($src_img);
		} else {
			if (!$this->image_save_gd($src_img)) {
				return FALSE;
			}
		}

		imagedestroy($src_img);
		imagedestroy($wm_img);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Watermark - Text Version
	 *
	 * @access  public
	 * @return  bool
	 */
	function text_watermark() {
		if (!($src_img = $this->image_create_gd())) {
			return FALSE;
		}

		if ($this->wm_use_truetype == TRUE AND !file_exists($this->wm_font_path)) {
			$this->set_error('imglib_missing_font');
			return FALSE;
		}

		//  Fetch source image properties
		$this->get_image_properties();

		// Set RGB values for text and shadow
		$this->wm_font_color = str_replace('#', '', $this->wm_font_color);
		$this->wm_shadow_color = str_replace('#', '', $this->wm_shadow_color);

		$R1 = hexdec(substr($this->wm_font_color, 0, 2));
		$G1 = hexdec(substr($this->wm_font_color, 2, 2));
		$B1 = hexdec(substr($this->wm_font_color, 4, 2));

		$R2 = hexdec(substr($this->wm_shadow_color, 0, 2));
		$G2 = hexdec(substr($this->wm_shadow_color, 2, 2));
		$B2 = hexdec(substr($this->wm_shadow_color, 4, 2));

		$txt_color = imagecolorclosest($src_img, $R1, $G1, $B1);
		$drp_color = imagecolorclosest($src_img, $R2, $G2, $B2);

		// Reverse the vertical offset
		// When the image is positioned at the bottom
		// we don't want the vertical offset to push it
		// further down.  We want the reverse, so we'll
		// invert the offset.  Note: The horizontal
		// offset flips itself automatically

		if ($this->wm_vrt_alignment == 'B') {
			$this->wm_vrt_offset = $this->wm_vrt_offset * -1;
		}

		if ($this->wm_hor_alignment == 'R') {
			$this->wm_hor_offset = $this->wm_hor_offset * -1;
		}

		// Set font width and height
		// These are calculated differently depending on
		// whether we are using the true type font or not
		if ($this->wm_use_truetype == TRUE) {
			if ($this->wm_font_size == '') {
				$this->wm_font_size = '17';
			}

			$fontwidth = $this->wm_font_size - ($this->wm_font_size / 4);
			$fontheight = $this->wm_font_size;
			$this->wm_vrt_offset += $this->wm_font_size;
		} else {
			$fontwidth = imagefontwidth($this->wm_font_size);
			$fontheight = imagefontheight($this->wm_font_size);
		}

		// Set base X and Y axis values
		$x_axis = $this->wm_hor_offset + $this->wm_padding;
		$y_axis = $this->wm_vrt_offset + $this->wm_padding;

		// Set verticle alignment
		if ($this->wm_use_drop_shadow == FALSE) {
			$this->wm_shadow_distance = 0;
		}

		$this->wm_vrt_alignment = strtoupper(substr($this->wm_vrt_alignment, 0, 1));
		$this->wm_hor_alignment = strtoupper(substr($this->wm_hor_alignment, 0, 1));

		switch ($this->wm_vrt_alignment) {
			case "T":
				break;
			case "M":$y_axis += ($this->orig_height / 2) + ($fontheight / 2);
				break;
			case "B":$y_axis += ($this->orig_height - $fontheight - $this->wm_shadow_distance - ($fontheight / 2));
				break;
		}

		$x_shad = $x_axis + $this->wm_shadow_distance;
		$y_shad = $y_axis + $this->wm_shadow_distance;

		// Set horizontal alignment
		switch ($this->wm_hor_alignment) {
			case "L":
				break;
			case "R":
				if ($this->wm_use_drop_shadow) {
					$x_shad += ($this->orig_width - $fontwidth * strlen($this->wm_text));
				}

				$x_axis += ($this->orig_width - $fontwidth * strlen($this->wm_text));
				break;
			case "C":
				if ($this->wm_use_drop_shadow) {
					$x_shad += floor(($this->orig_width - $fontwidth * strlen($this->wm_text)) / 2);
				}

				$x_axis += floor(($this->orig_width - $fontwidth * strlen($this->wm_text)) / 2);
				break;
		}

		//  Add the text to the source image
		if ($this->wm_use_truetype) {
			if ($this->wm_use_drop_shadow) {
				imagettftext($src_img, $this->wm_font_size, 0, $x_shad, $y_shad, $drp_color, $this->wm_font_path, $this->wm_text);
			}

			imagettftext($src_img, $this->wm_font_size, 0, $x_axis, $y_axis, $txt_color, $this->wm_font_path, $this->wm_text);
		} else {
			if ($this->wm_use_drop_shadow) {
				imagestring($src_img, $this->wm_font_size, $x_shad, $y_shad, $this->wm_text, $drp_color);
			}

			imagestring($src_img, $this->wm_font_size, $x_axis, $y_axis, $this->wm_text, $txt_color);
		}

		//  Output the final image
		if ($this->dynamic_output == TRUE) {
			$this->image_display_gd($src_img);
		} else {
			$this->image_save_gd($src_img);
		}

		imagedestroy($src_img);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Create Image - GD
	 *
	 * This simply creates an image resource handle
	 * based on the type of image being processed
	 *
	 * @access  public
	 * @param string
	 * @return  resource
	 */
	function image_create_gd($path = '', $image_type = '') {
		if ($path == '') {
			$path = $this->full_src_path;
		}

		if ($image_type == '') {
			$image_type = $this->image_type;
		}

		switch ($image_type) {
			case 1:
				if (!function_exists('imagecreatefromgif')) {
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_gif_not_supported'));
					return FALSE;
				}

				return imagecreatefromgif($path);
				break;
			case 2:
				if (!function_exists('imagecreatefromjpeg')) {
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_jpg_not_supported'));
					return FALSE;
				}

				return imagecreatefromjpeg($path);
				break;
			case 3:
				if (!function_exists('imagecreatefrompng')) {
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_png_not_supported'));
					return FALSE;
				}

				return imagecreatefrompng($path);
				break;

		}

		$this->set_error(array('imglib_unsupported_imagecreate'));
		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Write image file to disk - GD
	 *
	 * Takes an image resource as input and writes the file
	 * to the specified destination
	 *
	 * @access  public
	 * @param resource
	 * @return  bool
	 */
	function image_save_gd($resource) {
		switch ($this->image_type) {
			case 1:
				if (!function_exists('imagegif')) {
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_gif_not_supported'));
					return FALSE;
				}

				if (!@imagegif($resource, $this->full_dst_path)) {
					$this->set_error('imglib_save_failed');
					return FALSE;
				}
				break;
			case 2:
				if (!function_exists('imagejpeg')) {
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_jpg_not_supported'));
					return FALSE;
				}

				if (!@imagejpeg($resource, $this->full_dst_path, $this->quality)) {
					$this->set_error('imglib_save_failed');
					return FALSE;
				}
				break;
			case 3:
				if (!function_exists('imagepng')) {
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_png_not_supported'));
					return FALSE;
				}

				if (!@imagepng($resource, $this->full_dst_path)) {
					$this->set_error('imglib_save_failed');
					return FALSE;
				}
				break;
			default:
				$this->set_error(array('imglib_unsupported_imagecreate'));
				return FALSE;
				break;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Dynamically outputs an image
	 *
	 * @access  public
	 * @param resource
	 * @return  void
	 */
	function image_display_gd($resource) {
		header("Content-Disposition: filename={$this->source_image};");
		header("Content-Type: {$this->mime_type}");
		header('Content-Transfer-Encoding: binary');
		header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');

		switch ($this->image_type) {
			case 1:imagegif($resource);
				break;
			case 2:imagejpeg($resource, '', $this->quality);
				break;
			case 3:imagepng($resource);
				break;
			default:echo 'Unable to display the image';
				break;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Re-proportion Image Width/Height
	 *
	 * When creating thumbs, the desired width/height
	 * can end up warping the image due to an incorrect
	 * ratio between the full-sized image and the thumb.
	 *
	 * This function lets us re-proportion the width/height
	 * if users choose to maintain the aspect ratio when resizing.
	 *
	 * @access  public
	 * @return  void
	 */
	function image_reproportion() {
		if (!is_numeric($this->width) OR !is_numeric($this->height) OR $this->width == 0 OR $this->height == 0) {
			return;
		}

		if (!is_numeric($this->orig_width) OR !is_numeric($this->orig_height) OR $this->orig_width == 0 OR $this->orig_height == 0) {
			return;
		}

		$new_width = ceil($this->orig_width * $this->height / $this->orig_height);
		$new_height = ceil($this->width * $this->orig_height / $this->orig_width);

		$ratio = (($this->orig_height / $this->orig_width) - ($this->height / $this->width));

		if ($this->master_dim != 'width' AND $this->master_dim != 'height') {
			$this->master_dim = ($ratio < 0) ? 'width' : 'height';
		}

		if (($this->width != $new_width) AND ($this->height != $new_height)) {
			if ($this->master_dim == 'height') {
				$this->width = $new_width;
			} else {
				$this->height = $new_height;
			}
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Get image properties
	 *
	 * A helper function that gets info about the file
	 *
	 * @access  public
	 * @param string
	 * @return  mixed
	 */
	function get_image_properties($path = '', $return = FALSE) {
		// For now we require GD but we should
		// find a way to determine this using IM or NetPBM

		if ($path == '') {
			$path = $this->full_src_path;
		}

		if (!file_exists($path)) {
			$this->set_error('imglib_invalid_path');
			return FALSE;
		}

		$vals = @getimagesize($path);

		$types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png');

		$mime = (isset($types[$vals['2']])) ? 'image/' . $types[$vals['2']] : 'image/jpg';

		if ($return == TRUE) {
			$v['width'] = $vals['0'];
			$v['height'] = $vals['1'];
			$v['image_type'] = $vals['2'];
			$v['size_str'] = $vals['3'];
			$v['mime_type'] = $mime;

			return $v;
		}

		$this->orig_width = $vals['0'];
		$this->orig_height = $vals['1'];
		$this->image_type = $vals['2'];
		$this->size_str = $vals['3'];
		$this->mime_type = $mime;

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Size calculator
	 *
	 * This function takes a known width x height and
	 * recalculates it to a new size.  Only one
	 * new variable needs to be known
	 *
	 *  $props = array(
	 *          'width'     => $width,
	 *          'height'    => $height,
	 *          'new_width'   => 40,
	 *          'new_height'  => ''
	 *          );
	 *
	 * @access  public
	 * @param array
	 * @return  array
	 */
	function size_calculator($vals) {
		if (!is_array($vals)) {
			return;
		}

		$allowed = array('new_width', 'new_height', 'width', 'height');

		foreach ($allowed as $item) {
			if (!isset($vals[$item]) OR $vals[$item] == '') {
				$vals[$item] = 0;
			}

		}

		if ($vals['width'] == 0 OR $vals['height'] == 0) {
			return $vals;
		}

		if ($vals['new_width'] == 0) {
			$vals['new_width'] = ceil($vals['width'] * $vals['new_height'] / $vals['height']);
		} elseif ($vals['new_height'] == 0) {
			$vals['new_height'] = ceil($vals['new_width'] * $vals['height'] / $vals['width']);
		}

		return $vals;
	}

	// --------------------------------------------------------------------

	/**
	 * Explode source_image
	 *
	 * This is a helper function that extracts the extension
	 * from the source_image.  This function lets us deal with
	 * source_images with multiple periods, like:  my.cool.jpg
	 * It returns an associative array with two elements:
	 * $array['ext']  = '.jpg';
	 * $array['name'] = 'my.cool';
	 *
	 * @access  public
	 * @param array
	 * @return  array
	 */
	function explode_name($source_image) {
		$ext = strrchr($source_image, '.');
		$name = ($ext === FALSE) ? $source_image : substr($source_image, 0, -strlen($ext));

		return array('ext' => $ext, 'name' => $name);
	}

	// --------------------------------------------------------------------

	/**
	 * Is GD Installed?
	 *
	 * @access  public
	 * @return  bool
	 */
	function gd_loaded() {
		if (!extension_loaded('gd')) {
			if (!dl('gd.so')) {
				return FALSE;
			}
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Get GD version
	 *
	 * @access  public
	 * @return  mixed
	 */
	function gd_version() {
		if (function_exists('gd_info')) {
			$gd_version = @gd_info();
			$gd_version = preg_replace("/\D/", "", $gd_version['GD Version']);

			return $gd_version;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Set error message
	 *
	 * @access  public
	 * @param string
	 * @return  void
	 */
	function set_error($msg) {
		$CI = &get_instance();
		$CI->lang->load('imglib');

		if (is_array($msg)) {
			foreach ($msg as $val) {

				$msg = ($CI->lang->line($val) == FALSE) ? $val : $CI->lang->line($val);
				$this->error_msg[] = $msg;
				// log_message('error', $msg);
			}
		} else {
			$msg = ($CI->lang->line($msg) == FALSE) ? $msg : $CI->lang->line($msg);
			$this->error_msg[] = $msg;
			// log_message('error', $msg);
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Show error messages
	 *
	 * @access  public
	 * @param string
	 * @return  string
	 */
	function display_errors($open = '<p>', $close = '</p>') {
		$str = '';
		foreach ($this->error_msg as $val) {
			$str .= $open . $val . $close;
		}

		return $str;
	}

}